according to documents leaked by former edward snowden, the national security agency has been monitoring online games like world of war craft, even posing as trolls to look for terrorists posing as gamers. >> i think a lot of times when you're playing video games or on facebook, you want to be friendly with everybody. you never know who is on the other side. >> reporter: that's the virtual world. there's also talk today about this, an ad taken out in big city newspapers by silicon valley tech rivals like google, yahoo, twitter, facebook, and linked-in urging u.s. officials to reign in security policies and protect the data we give to companies like these. at barracuda networks, security is their business. >> if you don't want it on the internet, don't put it on there in the first place. >> reporter: it's up to us to make sure the government and these companies don't use our data in ways we don't want. we reached out to the companies who participated to be part of this story, but none of them agreed to go on camera to talk with us. >>> tomorrow the ntsb will hold hearings in the deadly ai